|Use:||Explosimeters are used to verify flammable gas concentration in the atmosphere. Instruments can be used in the immediate environment or can draw samples from remote areas through the use of sampling lines or probes.|
The instrument operates by the catalytic action of a heated filament in contact with combustible gases. The filament is heated to operating temperature by passage of an electrical current. When the gas sample contacts the heated filament, combustion on the surface raises the temperature in proportion to the quantity of combustibles in the sample. A sensor measures the change in electrical resistance due to the temperature increases. A signal is processed and displayed as the percentage of the combustible gas present to the total required to reach the lower explosive limit (LEL) and/or the percent combustible gas by volume.
1. Non-Halogenated VOCs
|Requires extraction to liquid or gas phase||Requires extraction to liquid or gas phase||BETTER|
|Selectivity:||Technique measures a part of the compound.|
|Susceptibility to Interference:||High.|
|Detection Limits :||10-100 ppm (soil); 0.5-10 ppm (water).|
|Turnaround Time per Sample:||Minutes.|
ASTM Standards/EPA Methods:
No applicable ASTM standards or EPA methods are cited for this technology.
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